These cards are classy and would make a great full-set collector's item, but given that they're only for rare or mythic rare Heroes and Villains, they're going to be difficult to find in packs without having to buy some as singles
In any case, the fact that it specifically hits battles means that its user is encouraged to do so whenever strategically appropriate
This is a real issue when most Vintage Cubes have a Black Lotus, all the Moxen, Time Walk, and more
It may be too late for LATIN0, who posted that he had returned to the landfill but could not find the pallets
Theres also an OS community focused format that plays with the idea of the Four Horsemen
Extreme: Same as Hard, but adds strict challenges and additional rules, such as deck restrictions and specific victory conditions